If you use:
 - TypeScript, make sure your `tsconfig.json` doesn't transpile to CJS (e.g. make sure `tsconfig.json#compilerOptions.module` isn't set to `CommonJS`).
 - `ts-node`, make sure your `tsconfig.json#ts-node` doesn't transpile to CJS (e.g. make sure `tsconfig.json#ts-node.compilerOptions.module` isn't set to `CommonJS`)
